When fluid begins flowing through these channels, endothelial cells move in to line the channels while muscle cells move away.
当流体流经这些管腔时，肌肉细胞会分散开，内皮细胞则布满管腔。
2
The continental dividerefers to an imaginary line in the North American Rockies that dividesthe waters flowing into the Atlantic Ocean from those flowing into thePacific.
大陆分水岭是指北美洛矶山脉上的一道想象线，该线把大西洋流域和太平洋流域区分开来。
3
Contour line is the flowing environment while the pedestrian flow is an indispensable and important component among it.